package com.qlu.casualtalk.interceptor;

import com.qlu.casualtalk.constant.JwtConstant;
import com.qlu.casualtalk.constant.MessageConstant;
import com.qlu.casualtalk.util.JwtUtil;
import com.qlu.casualtalk.util.Result;
import com.qlu.casualtalk.util.ThreadLocalUtil;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;

import java.util.Map;


/**
 * jwt令牌校验的拦截器
 */
@Component
@Slf4j
@RequiredArgsConstructor
public class JwtTokenUserInterceptor implements HandlerInterceptor {


    /**
     * 校验jwt
     *
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //判断当前拦截到的是Controller的方法还是其他资源
        if (!(handler instanceof HandlerMethod)) {
            //当前拦截到的不是动态方法，直接放行
            return true;
        }

        //1、从请求头中获取令牌

        System.out.println(request);
        String token = request.getHeader(JwtConstant.tokenName);

        //2、校验令牌
        try {
            log.info("jwt校验:{}", token);
            Map<String, Object> stringObjectMap = JwtUtil.parseToken(token);
            ThreadLocalUtil.set(stringObjectMap);
            log.info("当前用户id：{}", stringObjectMap.get("id"));
            //3、通过，放行
            return true;
        } catch (Exception ex) {
            //4、不通过，响应401状态码
            response.setStatus(401);
            //使用utf-8编码，解决中文乱码问题
            response.setCharacterEncoding("utf-8");
            response.getWriter().write(Result.error(MessageConstant.USER_NOT_LOGIN).toString());
            return false;  //拦截
        }
    }
}
